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Politics : Formerly About Advanced Micro Devices

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To: tejek who wrote (356151)	10/26/2007 10:27:43 PM
From: longnshort	Read Replies (1) of 1578122

The study, in which Cook was joined by scientists from the National Oceanic and Atmospheric Administration as well as the universities of Arizona and Arkansas, maps a 400-year period of recurring mega-droughts that make the West's current five-year dry spell look puny. "Compared to the earlier 'mega-droughts' that are reconstructed to have occurred around AD 936, 1034, 1150 and 1253, the current drought does not stand out as an extreme event because it has not yet lasted nearly as long," the authors wrote. "This is a disquieting result because future droughts in the West of similar duration to those seen prior to AD 1300 would be disastrous." Cook called the centuries between 900 and 1300 "the most persistently dry period on record in the last 1,200 years." Large portions of the West were gripped by droughts that lasted two or three decades at a time, dwarfing the current drought that, despite its comparative brevity, has dramatically shrunk reservoirs and raised the possibility of water shortages in the Colorado River Basin.

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